This apply is called on the interactive object with the parameter given
by the SE telnet suboption, for mudlib defined processing. For exam‐
ple, this allows for future support of terminal types.
The first byte of the buffer is typically a type descriptor, ie
TELOPT_TTYPE. The next byte is a procession option, such as TELQUAL_IS.
Following this is the type dependent data. In the case of a terminal
type call, the data will be routed through through the terminal_type()
#define TELQUAL_IS 0 // option is...
#define TELQUAL_SEND 1 // send options
#define TELQUAL_INFO 2 // ENVIRON: informational version of IS
#define TELQUAL_REPLY 3 // AUTHENTICATION: client version of IS
#define TELQUAL_NAME 4 // AUTHENTICATION: client version of IS